Re: Risk of RULE mode in 10g+

From: <>
Date: Mon, 15 Mar 2010 20:10:21 +0000

There's no risk as far as I know. We have a customer in a similar situation reported from you with a installation with no problem.

I may suggest you also to try to run you apps with CBO and check if you experience any real problem. Also if you have a license you can also use Sql advisor and Sql tuning to gain needed performances.



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-----Original Message-----

From: Jeffrey Zollars <> Date: Mon, 15 Mar 2010 12:21:53
To: <>
Subject: Risk of RULE mode in 10g+

We are upgrading an application to the current version and also upgrading the DB version from 9i to 10g. The application code has several bits of code that are explicitly setting RULE mode. One in a configuration table that can be updated. Second, in several hints coded in SQL statements which cannot be easily changed.

I have provided Oracle documentation to the application vendor showing that RULE mode is desupported in 10g+ versions. They were skeptical to say the least.

I had thought that I'd seen stronger warnings that RULE mode could actually generate incorrect result sets when running queries. I have searched but could not find those warnings now. I am trying to make a case to request the application vendor to go back and modify the code before we update to the current version of the application on Oracle version. I'm concerned about the integrity of the result sets.

I am wondering if anyone knows of or can provide a link to the warning that result sets may be incorrect in 10g+ using RULE mode.



J. A. Zollars

-- Received on Mon Mar 15 2010 - 15:10:21 CDT

Original text of this message